• Surface Condition. Bolts need not be finished on any surface except threads.
  • Top of Head. Top of head shall be full form and chamfered with the diameter of chamfer circle being equal to the maximum width across flats, within a tolerance of minus 15 percent.
  • Head Taper. Maximum width across flats and across corners shall not be exceeded. No transverse section through the head between 25 percent and 75 percent of actual head height, as measured from the bearing surface, shall be less than the minimum width across flats and across corners.
  • Bearing Surface. A die seam across the bearing surface is permissible. Bearing surface shall be perpendicular to the axis of the body within a tolerance of 3 deg for 1.
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Unit of Measure
Items
Rolled Thread Hex Bolts

Hex Bolt, 1/4" Nominal Dia.
Rolled Thread Hex Bolts

Hex Bolt, 5/16" Nominal Dia.
Rolled Thread Hex Bolts

Hex Bolt, 3/8" Nominal Dia.
Rolled Thread Hex Bolts

Hex Bolt, 7/16" Nominal Dia.
Rolled Thread Hex Bolts

Hex Bolt, 1/2" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Square and Hex Bolts and Screws
Codes and Standards N/A ASME B18.2.1 1996
Unit of Measure N/A English
Nominal Size or Basic Product Diameter N/A 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in N/A 1/2 in
Nominal Size or Basic Product Diameter (Decimal) N/A 0.2500 in N/A 0.3125 in N/A 0.3750 in N/A 0.4375 in N/A 0.5000 in
Max. Full-Size Body Diameter (E) N/A 0.260 in N/A 0.324 in N/A 0.388 in N/A 0.452 in N/A 0.515 in
Min. Full-Size Body Diameter (E) N/A 0.237 in N/A 0.298 in N/A 0.360 in N/A 0.421 in N/A 0.482 in
Basic Width Across Flats (F) N/A 7/16 in N/A 1/2 in N/A 9/16 in N/A 5/8 in N/A 3/4 in
Max. Width Across Flats (F) N/A 0.438 in N/A 0.500 in N/A 0.562 in N/A 0.625 in N/A 0.750 in
Min. Width Across Flats (F) N/A 0.425 in N/A 0.484 in N/A 0.544 in N/A 0.603 in N/A 0.725 in
Max. Width Across Corners (G) N/A 0.505 in N/A 0.577 in N/A 0.650 in N/A 0.722 in N/A 0.866 in
Min. Width Across Corners (G) N/A 0.484 in N/A 0.552 in N/A 0.620 in N/A 0.687 in N/A 0.826 in
Basic Head Height (H) N/A 11/64 in N/A 7/32 in N/A 1/4 in N/A 19/64 in N/A 11/32 in
Max. Head Height (H) N/A 0.188 in N/A 0.235 in N/A 0.268 in N/A 0.316 in N/A 0.364 in
Min. Head Height (H) N/A 0.150 in N/A 0.195 in N/A 0.226 in N/A 0.272 in N/A 0.302 in
Max. Radius of Fillet (R) N/A 0.03 in
Min. Radius of Fillet (R) N/A 0.010 in
Nom. LT for Bolt Length (6 in. and Shorter) N/A 0.750 in N/A 0.875 in N/A 1.000 in N/A 1.125 in N/A 1.250 in
Nom. LT for Bolt Length (Over 6 in.) N/A 1.000 in N/A 1.125 in N/A 1.250 in N/A 1.375 in N/A 1.500 in
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